A publicly accessible, internet-connected printer is almost directly analogous to a fax machine that you can phone, transmit a document, and have it print out o

A publicly accessible, internet-connected printer is almost directly analogous to a fax machine that you can phone, transmit a document, and have it print out on the other side. Maybe you intend the phone number to only be called by certain people, but the default behavior will be for the fax machine to accept calls from anybody in the world. So it is for a printer with a public IP address. Sending faxes in this manner (without prior business relationship; not respecting opt-out, etc.) is an FCC violation; it's not hacking. Why would printing be any different? I agree with you on the ethics/morality of it all.